JP2014191952A - Connector for multilayer substrate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve stability of contact by reducing influences caused by variance in dimension precision or strength of a multilayer substrate and/or preventing deformation of a multilayer substrate 2 while connecting a tabular cable to an intermediate layer of the multilayer substrate.SOLUTION: A connector for a multilayer substrate comprises: a substrate-side connection part 1 disposed within an insertion port 2a formed on a thick surface of the multilayer substrate 2; and a cable-side connection part 101 provided in a distal end portion of a tabular cable 3 and inserted into the insertion port 2a so as to be electrically connected with the substrate-side connection part 1 in an intermediate layer of the multilayer substrate 2. The substrate-side connection part 1 includes a columnar terminal 61 and the cable-side connection part 101 includes tabular terminals 151 and 161. The columnar terminal 61 is formed protrusively from the intermediate layer of the multilayer substrate 2 in a thickness direction. The tabular terminals 151 and 161 include elastic contact portions 155 and 165 which are elastically brought into contact width a side surface portion of the columnar terminal 61 in a width direction of the insertion port 2a in response to the insertion of the cable-side connection part 101 into the insertion port 2a.

Description

  The present invention relates to a multilayer board connector for connecting a flat cable such as an FPC to an intermediate layer of a multilayer board.

  In electronic devices such as mobile phones and smartphones, multilayer boards with printed circuit boards formed in a laminated form are widely used in order to cope with higher wiring pattern density, and the connection between multilayer boards and electronic component modules is widely used. In addition, a flat cable such as an FPC is used for connection between the boards.

  Conventionally, when connecting a flat cable to a multilayer board, the connector was mounted on the surface of the multilayer board, and the flat cable was connected here, but when the connector was mounted on the surface of the multilayer board, the connector was included. Not only does the thickness dimension of the multilayer board increase, but the area occupied by the connector on the multilayer board increases, which may hinder the miniaturization of the multilayer board and electronic equipment.

  In recent years, therefore, it has been proposed to connect a flat cable to an intermediate layer of a multilayer board. For example, Patent Document 1 discloses a multilayer board connection structure in which a flat cable and a multilayer board are electrically connected by inserting a flat cable into an insertion port formed in the board thickness surface of the multilayer board. ing.

FIG. 15 is a schematic cross-sectional view showing a multilayer board connector according to a conventional example.
As shown in this figure, the connector for connecting the flat cable 3 to the intermediate layer of the multilayer board 2 is a board-side connection portion 801 disposed in the insertion port 2a formed on the plate thickness surface of the multilayer board 2. And a cable-side connection portion 901 provided at the tip of the flat cable 3, and a leaf spring-like terminal provided in the board-side connection portion 801 in accordance with the insertion of the cable-side connection portion 901 into the insertion port 2 a. 851 is elastically brought into contact with the terminal portion of the cable-side connecting portion 901, or the leaf spring-like terminal provided in the cable-side connecting portion is elastically brought into contact with the terminal of the board-side connecting portion as in Patent Document 1. By doing so, the flat cable 3 is electrically connected to the intermediate layer of the multilayer substrate 2.

JP 2004-335548 A

  However, in the conventional multilayer board connector as shown in FIG. 15 or Patent Document 1, the reaction force of the leaf spring-like terminal 851 is applied to the upper laminated board (first laminated board 2b) or lower laminated board (first board) of the insertion port 2a. Since the structure is received by the three laminated substrates 2d), the contact gap (spring displacement) of the leaf spring-like terminal 851 is affected by variations in the dimensional accuracy and strength of the multilayer substrate 2, and / or the plate. Since the multilayer substrate 2 is deformed against the elastic force of the spring-like terminal 851, the contact stability may not be obtained.

  Therefore, the present invention has been made in view of the above-described problems, and reduces the influence of variations in dimensional accuracy and strength of the multilayer board while connecting the flat cable to the intermediate layer of the multilayer board. Another object of the present invention is to provide a connector for a multilayer board that can prevent deformation of the multilayer board 2 and / or improve contact stability.

  The present invention has been proposed to achieve the above object, and is provided at a board-side connection portion disposed in an insertion port formed on a plate thickness surface of a multilayer board, and at a tip portion of a flat cable, A connector for a multilayer board, comprising: a cable-side connection part electrically connected to the board-side connection part in an intermediate layer of the multilayer board by insertion into the insertion port, the board-side connection part or the cable-side connection One of the parts includes a columnar terminal and the other includes a flat plate terminal, and the columnar terminal protrudes from the intermediate layer of the multilayer substrate or the tip of the flat cable in the thickness direction of the multilayer substrate or the flat cable. The flat terminal is provided with an elastic contact portion that elastically contacts the side surface portion of the columnar terminal from the width direction of the insertion port according to the insertion of the cable side connection portion into the insertion port. The features.

  In addition, a plurality of contact portions between the flat terminal and the columnar terminal are provided, and reaction forces of the flat terminal generated at the plurality of contact portions cancel each other.

  Further, the reaction force of the flat plate terminal that contacts the columnar terminal from one side is offset by the reaction force of the flat plate terminal that contacts the same columnar terminal from the other side.

  Further, the reaction force of the flat plate terminal that contacts the columnar terminal from one side is offset by the reaction force of the flat plate terminal that contacts the other columnar terminal from the other side.

  The columnar terminal includes a small-diameter portion that defines a contact position of the flat-plate terminal.

  The columnar terminals are protrusions formed by using an etching method.

  The board-side connection portion includes the columnar terminal and an insertion guide formed by using an etching method, and the insertion guide guides insertion of the cable-side connection portion into the insertion port.

  According to the present invention, while the flat cable is connected to the intermediate layer of the multilayer substrate, the influence of variations in the dimensional accuracy and strength of the multilayer substrate is reduced, or / or deformation of the multilayer substrate is prevented, Contact stability can be improved.

BRIEF DESCRIPTION OF THE DRAWINGS It is a perspective view which shows the multilayer substrate and flat cable to which the connector for multilayer substrates which concerns on 1st Embodiment of this invention is applied, (a) is a perspective view which shows a non-connection state, (b) abbreviate | omits one part It is the perspective view which exposed the board | substrate side connection part and the cable side connection part. It is a figure which shows the multilayer substrate to which the connector for multilayer substrates which concerns on 1st Embodiment of this invention was applied, (a) is a top view of a multilayer substrate, (b) is a front view of a multilayer substrate, (c) is a multilayer The bottom view of a board | substrate and (d) are side views of a multilayer board | substrate. It is a figure which shows the multilayer substrate to which the connector for multilayer substrates which concerns on 1st Embodiment of this invention was applied, (a) is AA sectional drawing of a multilayer substrate, (b) is an enlarged front view of a columnar terminal. . It is a figure which shows the flat cable with which the connector for multilayer substrates which concerns on 1st Embodiment of this invention was applied, (a) is a top view of a flat cable, (b) is a side view of a flat cable, (c) ) Is a bottom view of the flat cable. It is a figure which shows the cable side connection part of the connector for multilayer substrates which concerns on 1st Embodiment of this invention, (a) is an enlarged top view of a cable side connection part, (b) is an enlarged bottom view of a cable side connection part. is there. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a multilayer board and a flat cable to which the multilayer board connector according to the first embodiment of the present invention is applied, (a) is a perspective view showing a connection state, and (b) is a cross section showing the connection state. FIG. It is a perspective view which shows the board | substrate side connection part and cable side connection part of the connector for multilayer substrates which concern on 2nd Embodiment of this invention. It is a perspective view which shows the connection state of the multilayer board | substrate with which the connector for multilayer boards concerning 3rd Embodiment of this invention was applied, and a flat cable. It is a figure which shows the multilayer substrate to which the connector for multilayer substrates which concerns on 3rd Embodiment of this invention was applied, (a) is a top view of a multilayer substrate, (b) is a front view of a multilayer substrate, (c) is a multilayer The bottom view of a board | substrate and (d) are side views of a multilayer board | substrate. It is BB sectional drawing of the multilayer substrate to which the connector for multilayer substrates which concerns on 3rd Embodiment of this invention was applied. It is a perspective view which shows the connection state of the multilayer board | substrate with which the connector for multilayer boards concerning 4th Embodiment of this invention was applied, and a flat cable. It is a figure which shows the connection state of the multilayer board | substrate and flat cable to which the connector for multilayer boards concerning 4th Embodiment of this invention was applied, (a) is a top view of a multilayer board and a flat cable, (b) is FIG. 3C is a front view of the multilayer board and the flat cable, FIG. 3C is a bottom view of the multilayer board and the flat cable, and FIG. 3D is a side view of the multilayer board and the flat cable. It is a perspective view which shows the connection state of the multilayer board | substrate with which the connector for multilayer boards concerning 5th Embodiment of this invention was applied, and a flat cable. It is a figure which shows the connection state of the multilayer substrate and flat cable to which the connector for multilayer substrates which concerns on 5th Embodiment of this invention is applied, (a) is a top view of a multilayer substrate and a flat cable, (b) is FIG. 3C is a front view of the multilayer board and the flat cable, FIG. 3C is a bottom view of the multilayer board and the flat cable, and FIG. 3D is a side view of the multilayer board and the flat cable. It is a schematic sectional drawing which shows the connector for multilayer substrates which concerns on a prior art example.

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the drawings. Note that the same reference numerals are given to the same elements throughout the description of the embodiment. Also, in a multilayer board (board-side connection part), the front side is the plate thickness surface where the insertion port of the flat cable (cable side connection part) is formed, and the insertion / extraction direction of the flat cable with respect to the insertion port is the front-rear direction, the multilayer The description will be made assuming that the thickness direction of the substrate is the vertical direction and the width direction of the insertion slot is the horizontal direction.

In the flat cable (cable side connecting portion), the flat cable insertion / extraction direction with respect to the insertion port is the front-rear direction, the flat cable thickness direction is the vertical direction, and the flat cable width direction is the horizontal direction. .

FIG. 1 is a perspective view showing a multilayer board and a flat cable to which the multilayer board connector according to the first embodiment of the present invention is applied. FIG. 1 (a) is a perspective view showing a non-connected state, and FIG. It is the perspective view which abbreviate | omitted one part and exposed the board | substrate side connection part and the cable side connection part.
As shown in this figure, the connector for a multilayer board according to the first embodiment of the present invention includes a board-side connecting portion 1 disposed in an insertion slot 2a formed on the plate thickness surface of the multilayer board 2, and a flat plate shape. A cable-side connection portion 101 is provided at the distal end portion of the cable 3 and electrically connected to the substrate-side connection portion 1 at the intermediate layer of the multilayer substrate 2 by insertion into the insertion port 2a.

  The multilayer substrate 2 and the flat cable 3 shown in the figure do not show the whole, but are obtained by trimming a portion where the multilayer substrate connector is provided. For example, the flat cable 3 is usually a long belt-like member, but in the drawing, for the sake of illustration, the rear (lower left in FIG. 1) portion is shown in a cut-out state.

2A and 2B are diagrams showing a multilayer board to which the multilayer board connector according to the first embodiment of the present invention is applied, wherein FIG. 2A is a top view of the multilayer board, FIG. 2B is a front view of the multilayer board, c) is a bottom view of the multilayer substrate, and (d) is a side view of the multilayer substrate.
As shown in this figure, the multilayer substrate 2 is composed of a printed circuit board formed in a laminated form. For example, the multilayer board 2 of the present embodiment has a three-layer printed board. Hereinafter, the board laminated on the upper side is the first laminated board 2b, the board laminated on the middle is the second laminated board 2c, and the lower side. The substrate laminated on the substrate is referred to as a third laminated substrate 2d.

3A and 3B are diagrams showing a multilayer board to which the multilayer board connector according to the first embodiment of the present invention is applied. FIG. 3A is a cross-sectional view taken along line AA of the multilayer board, and FIG. It is a front view.
As shown in this figure, in the multilayer substrate 2 of the present embodiment, an insertion port 2a is formed by removing a part of the second laminated substrate 2c into a rectangular shape. And the board | substrate side connection part 1 provided with the conductor pattern 51, the columnar terminal 61, and the insertion guide 71 is provided in the insertion port 2a. The vertical dimension of the multilayer substrate 2 and the insertion slot 2a of this embodiment is 0.7 [mm] and 0.4 [mm], but is not limited to this dimension, and any dimension. May be.

  The conductor pattern 51 is provided on the lower surface or the upper surface in the insertion port 2a. For example, in this embodiment, four conductor patterns 51 are provided on the upper surface of the third laminated substrate 2d, which is the lower surface in the insertion slot 2a. Each conductor pattern 51 is parallel to the left-right direction along the front-rear direction, and is connected to another conductor pattern (not shown) of the multilayer substrate 2. Adjacent conductor patterns 51 are separated from each other through an insulating space 52.

  The columnar terminal 61 is a protrusion formed so as to protrude upward from the surface of each conductor pattern 51. For example, a photolithography technique is applied to a copper foil having a spring property with a thickness of several [μm] to several tens [μm]. It is formed integrally with the conductor pattern 51 by an etching method utilizing the above. In the present embodiment, the height of the columnar terminal 61 is slightly lower than the height of the insertion port 2a, and the upper surface of the columnar terminal 61 and the upper surface in the insertion port 2a (the lower surface of the first multilayer substrate 2b) A predetermined gap 62 is secured in between. The upper surface of the columnar terminal 61 and the upper surface in the insertion port 2a may be in contact with each other. In this case, a substrate that defines the upper and lower surfaces of the insertion port 2a (in this embodiment, the first laminated substrate 2b). It is possible to prevent the lower surface and the upper surface of the third laminated substrate 2d) from being deformed and the vertical dimension of the insertion port 2a from becoming narrow.

  Further, the shape of the upper surface and the cross section of the columnar terminal 61 is a substantially oval shape whose dimension in the front-rear direction is larger than that in the left-right direction, and the front (opening side of the insertion port 2a) is pointed. It is desirable to be. The reason is that the relative insertion of the columnar terminal 61 with respect to the cable side connection portion 101 (columnar terminal insertion portion 154, 164) becomes smooth. In the present embodiment, the shape of the upper surface and cross section of the columnar terminal 61 is substantially elliptical, but it may be a pentagon like a baseball base, a hexagon or a circle, and can be arbitrarily changed. it can.

  Further, the side surface shape of the columnar terminal 61 is desirably a concave surface as shown in FIG. The reason is that the contact position of the cable side connection portion 101 (elastic contact portions 155, 165) with respect to the side surface portion of the columnar terminal 61 is defined, and the connection can be stabilized. For example, in the present embodiment, the intermediate portion in the height direction of the columnar terminal 61 is a small diameter portion 63, and the diameter is gradually increased from the small diameter portion 63 toward the proximal end side and the distal end side, thereby forming a curved shape. A concave surface is formed.

  The insertion guides 71 are provided at both left and right end portions in the insertion port 2a, and guide the insertion of the cable side connection portion 101 into the insertion port 2a. The insertion guide 71 of the present embodiment is a protrusion that is formed to protrude upward from the surface of the conductor pattern 51 provided at both left and right end portions in the insertion opening 2a. For example, by an etching method using a photolithography technique, It is formed together with the conductor pattern 51 and the columnar terminal 61. Further, the height of the insertion guide 71 is slightly lower than the height of the insertion port 2a, and a predetermined distance is provided between the upper surface of the insertion guide 71 and the upper surface in the insertion port 2a (the lower surface of the first multilayer substrate 2b). The gap 72 is secured, but they may be in contact with each other.

  Further, the shape of the upper surface and the cross section of the insertion guide 71 can be arbitrarily changed as long as it can guide the insertion of the cable side connection portion 101, but the insertion of the cable side connection portion 101 is guided. Thus, not only the insertion guide portion 73 extending in the front-rear direction along the left and right ends of the insertion port 2a, but also the stopper portion extending in the left-right direction that defines the insertion limit position of the cable side connection portion 101 74 is preferably provided. In this embodiment, the insertion guide portion 73 and the stopper portion 74 are integrally formed, but may be formed separately.

  Next, the configuration of the flat cable 3 and the cable-side connecting portion 101 will be described.

4A and 4B are diagrams showing a flat cable to which the multilayer board connector according to the first embodiment of the present invention is applied. FIG. 4A is a top view of the flat cable, and FIG. 4B is a side view of the flat cable. FIG. 4C is a bottom view of the flat cable.
The flat cable 3 is a flat flexible cable called FPC (Flexible Printed Circuit: Flexible Circuit Board), FFC (Flexible Flat Cable), etc. It may be a substrate or any kind of substrate.

  The flat cable 3 of the present embodiment is made of FPC, and a plurality of base films 3a, which are insulating thin plate members having a long belt-like shape, are arranged in parallel on one surface of the base film 3a. The present embodiment includes four (in this embodiment, four) conductor patterns 3b and a cover film 3c laminated so as to cover the conductor patterns 3b. At one end of the flat cable 3, the cover film 3c is removed, and the conductor pattern 3b is exposed.

5A and 5B are diagrams showing a cable side connection portion of the multilayer board connector according to the first embodiment of the present invention, wherein FIG. 5A is an enlarged top view of the cable side connection portion, and FIG. 5B is a view of the cable side connection portion. It is an enlarged bottom view.
As shown in this figure, the cable-side connecting portion 101 includes a plurality of flat terminals 151 and 161 and an insulating support plate 171 that integrally supports these terminals with a predetermined interval. Is provided with a rectangular planar shape that can be inserted into the insertion port 2a. And the cable side connection part 101 is mounted in the one end part of the flat cable 3 in the state in which each flat terminal 151,161 is electrically connected with the conductor pattern 3b, respectively.

  The flat terminals 151 and 161 are formed, for example, by performing etching and patterning on a copper foil having a spring property with a thickness of several [μm] to several tens [μm]. In the example shown in the figure, a pair of first flat terminals 151 arranged in parallel to each other and a pair of second flat terminals 161 arranged in parallel to the outside thereof are provided, and adjacent flat terminals 151 are provided. 161 are separated from each other through insulating spaces 152 and 162.

  The flat terminals 151 and 161 are integrally formed with tail portions 153 and 163 projecting rearward, and the tail portions 153 and 163 of the flat terminals 151 and 161 are conductors of the flat cable 3, respectively. It is electrically connected to the pattern 3b by soldering, an anisotropic conductive sheet, adhesion or the like.

  Each flat terminal 151, 161 includes a columnar terminal insertion portion 154, 164 that opens forward, and the columnar terminal insertion portion 154, 164 is elastic to the columnar terminal 61 when connected to the board-side connection portion 1. Elastic contact portions 155 and 165 are formed in contact with each other. That is, the arrangement of the elastic contact portions 155 and 165 is determined in accordance with the arrangement of the columnar terminals 61, and when the arrangement of the columnar terminals 61 is changed, the arrangement of the elastic contact portions 155 and 165 is adapted to the change. Will also be changed.

  The elastic contact portions 155 and 165 are formed by, for example, an etching method using a photolithography technique. Typically, the patterns remaining in the flat terminals 151 and 161 by the etching method become the elastic contact portions 155 and 165, and the columnar terminal insertion portions 154 and 164 are formed in the portions where the surrounding material is removed.

  The planar shape of the first flat terminal 151 is bilaterally symmetric and includes a pair of elastic contact portions 155 on both the left and right sides in the columnar terminal insertion portion 154. Each elastic contact portion 155 is connected to a base portion 155a connected to the periphery of the columnar terminal insertion portion 154, an arm portion 155b extending from the base portion 155a into the columnar terminal insertion portion 154, and a distal end portion of the arm portion 155b. And the arm portion 155b functions as a spring, thereby allowing the elastic displacement of the contact portion 155c in the left-right direction.

  In the first flat terminal 151, the distance between the elastic contact portions 155 facing left and right is formed to be wider on the opening side of the columnar terminal insertion portion 154 and narrower toward the back side. Thereby, the columnar terminal 61 is smoothly guided between the left and right contact portions 155c. Further, the interval between the contact portions 155c facing left and right is narrower than the small diameter portion 63 of the columnar terminal 61. When the columnar terminal 61 moves relatively between the contact portions 155c, the left and right contact portions are arranged. 155c is in contact with the side surface of the columnar terminal 61 and is spread. As a result, the left and right contact portions 155c are elastically brought into contact with the side surface portion of the columnar terminal 61 from both the left and right sides by the spring force of the arm portion 155b.

  The planar shape of the second flat terminal 161 is not bilaterally symmetric, and includes an elastic contact portion 165 and an inelastic contact portion 166 on the left and right sides in the columnar terminal insertion portion 164. The elastic contact portion 165 is connected to a base portion 165a connected to the periphery of the columnar terminal insertion portion 164, an arm portion 165b extending from the base portion 165a into the columnar terminal insertion portion 164, and a distal end portion of the arm portion 165b. The contact portion 165c is provided, and the arm portion 165b functions as a spring, so that elastic displacement of the contact portion 165c in the left-right direction is allowed.

  In the second flat terminal 161, the distance between the elastic contact portion 165 and the non-elastic contact portion 166 facing left and right is wide at the opening side of the columnar terminal insertion portion 164 and narrower toward the back side. Accordingly, the columnar terminal 61 is smoothly guided between the contact portion 165c of the elastic contact portion 165 and the contact portion 166a of the inelastic contact portion 166. Further, the interval between the contact portions 165c and 166a facing left and right is narrower than the small-diameter portion 63 of the columnar terminal 61. When the columnar terminal 61 moves relatively between the contact portions 165c and 166a, the contact is made. The portions 165c and 166a abut against the side surface portion of the columnar terminal 61, and one contact portion 165c is expanded. Thereby, one contact part 165c is elastically contacted from the side by the side part of the columnar terminal 61 with the spring force of the arm part 165b.

  The inelastic contact portion 166 of the second flat terminal 161 is superior in strength to the elastic contact portion 165, and functions as a guided portion that contacts the insertion guide 71 when inserted into the insertion port 2a. It has become. Further, the tip corner portion 166b of the non-elastic contact portion 166 and the tip corner portion 171a of the support plate 171 are chamfered in an inclined shape to facilitate insertion into the insertion port 2a.

  Next, a connection operation between the board-side connection unit 1 and the cable-side connection unit 101 will be described.

FIG. 6 is a perspective view showing a multilayer board and a flat cable to which the multilayer board connector according to the first embodiment of the present invention is applied, (a) is a perspective view showing a connection state, and (b) is a connection. It is sectional drawing which shows a state.
As shown in this figure, when the flat cable 3 is connected to the intermediate layer of the multilayer board 2, the cable side connection portion 101 provided at the tip of the flat cable 3 is connected to the plate thickness surface of the multilayer board 2. It inserts in the formed insertion port 2a. The cable-side connection portion 101 has front and back surfaces. When the cable-side connection portion 101 is inserted into the insertion port 2a with the support plate 171 facing upward, the support plate 171 passes through the gaps 62 and 72 in the insertion port 2a. However, if the support plate 171 is inserted into the insertion port 2a with the support plate 171 facing downward, the support plate 171 contacts the columnar terminal 61 and the insertion guide 71, and the insertion of the cable side connection portion 101 is restricted. . In addition, when using the cable side connection part 101 except the support plate 171 of the cable side connection part 101, the upper surface of the columnar terminal 61 or the insertion guide 71 is in contact with the lower surface of the insertion port 2a and does not have the gaps 62 and 72. You may connect with the board | substrate side connection part 1, and should just select suitably according to a use.

  Insertion of the cable side connection portion 101 into the insertion port 2a is guided by insertion guides 71 provided at both left and right end portions in the insertion port 2a. At this time, the non-elastic contact portion 166 that is superior in strength to the elastic contact portions 155 and 165 contacts the insertion guide 71, so that damage due to contact with the insertion guide 71 can also be prevented. .

  Further, the insertion guide 71 is formed together with the columnar terminal 61 by an etching method, and the positional accuracy with the columnar terminal 61 is extremely high. Therefore, the plate-shaped terminals 151 and 161 (elasticity) of the cable side connection portion 101 are guided by the guide of the insertion guide 71. The contact portions 155 and 165) can be accurately positioned with respect to the columnar terminal 61 of the board side connection portion 1.

  When the cable side connecting portion 101 is inserted into the insertion port 2a, the flat terminals 151 and 161 of the cable side connecting portion 101 come into contact with the columnar terminals 61 of the board side connecting portion 1, and the flat cable 3 is connected to the multilayer board. Electrically connected to the two intermediate layers. At this time, since the elastic contact portions 155 and 165 of the flat terminals 151 and 161 elastically contact the side surface of the columnar terminal 61 from the left and right directions, the reaction force of the flat terminals 151 and 161 is applied to the insertion port 2a. The upper and lower laminated substrates 2b and 2d do not need to be received, and as a result, the contact gap between the flat terminals 151 and 161 is avoided from being affected by variations in the dimensional accuracy and strength of the multilayer substrate 2, In addition, since the deformation of the multilayer substrate 2 is prevented, the contact stability can be improved.

  Specifically, when the cable side connection portion 101 is inserted into the insertion port 2 a, the left and right elastic contact portions 155 come into contact with the side surface portion of the columnar terminal 61 and push in the first flat terminal 151 of the cable side connection portion 101. Can be spread. Thereby, the left and right elastic contact portions 155 elastically contact the side surface portion of the columnar terminal 61 from both the left and right sides by the spring force of the arm portion 155b. Although a reaction force is generated at such an elastic contact portion, the reaction force cancels out by elastically contacting the side surface portion of the columnar terminal 61 from both the left and right sides.

  Further, when the cable side connection portion 101 is inserted into the insertion port 2 a, the elastic contact portion 165 and the non-elastic contact portion 166 contact the side surface portion of the columnar terminal 61 in the second flat terminal 161 of the cable side connection portion 101. In contact therewith, one elastic contact portion 165 is expanded. Thereby, the elastic contact part 165 elastically contacts the side part of the columnar terminal 61 from one side by the spring force of the arm part 165b. Although a reaction force is generated at such an elastic contact point, the reaction force is canceled out by arranging the pair of left and right second flat plate terminals 161 in the opposite directions. That is, the reaction force of the second flat terminal 161 that makes the elastic contact portion 165 contact the columnar terminal 61 from one side is the second flat terminal that makes the elastic contact portion 165 contact the other columnar terminal 61 from the other side. It is offset by 161 reaction force.

  Moreover, since the concave surface is formed by the small diameter part 63 in the side part of the columnar terminal 61 which the elastic contact parts 155 and 165 of the flat terminal 151 and 161 contact elastically, it is with the elastic contact parts 155 and 165. The contact position can be defined, and as a result, not only can the elastic contact portions 155 and 165 of the flat terminals 151 and 161 be prevented from coming off from the column terminals 61, but also the contact between the column terminals 61 and the flat terminals 151 and 161 can be reduced. A good contact state can be maintained.

  Further, when the elastic contact portions 155 and 165 of the plate-shaped terminals 151 and 161 are elastically contacted with the side surface portion of the columnar terminal 61 from the left and right directions, the positional error of the columnar terminal 61 is caused by the elasticity of the elastic contact portions 155 and 165. Although it is required to be smaller than the allowable displacement tolerance range, the columnar terminal 61 can be formed with high accuracy by an etching method, and can satisfy this requirement.

  Next, another embodiment of the present invention will be described. In addition, about the thing which has the same structure as 1st Embodiment, the description is abbreviate | omitted by providing the same code | symbol. The description of the same operation and the same effect as the first embodiment is also omitted.

FIG. 7 is a perspective view showing a board-side connecting part and a cable-side connecting part of the multilayer board connector according to the second embodiment of the present invention.
As shown in this figure, in the multilayer board connector according to the second embodiment of the present invention, the board-side connecting portion 201 is provided with flat terminals 151 and 161, and the cable-side connecting portion 301 is provided with columnar terminals 61. This is different from the first embodiment. In this case, the board-side connecting portion 201 is formed in a separate process from the multilayer board 2 and mounted in the insertion port 2a of the multilayer board 2. At this time, it is necessary to solder the tail portions 153 and 163 of the respective plate-like terminals 151 and 161 to the conductor pattern in the insertion port 2a in a state where the board-side connection portion 201 is inserted into the insertion port 2a of the multilayer substrate 2. However, this is realized by applying powder or granular solder or a thermosetting conductive adhesive to the tail portions 153 and 163 and performing a heat treatment after the insertion into the insertion port 2a.

FIG. 8 is a perspective view showing a connection state of a multilayer board and a flat cable to which the multilayer board connector according to the third embodiment of the present invention is applied, and FIG. 9 is a multilayer board according to the third embodiment of the present invention. 1A is a plan view of a multilayer board, FIG. 2B is a front view of the multilayer board, FIG. 3C is a bottom view of the multilayer board, and FIG. FIG. 10 is a BB cross-sectional view of a multilayer board to which the multilayer board connector according to the third embodiment of the present invention is applied.
As shown in this figure, the multilayer board connector according to the third embodiment of the present invention is different from the above embodiment in that the columnar terminals 461 of the board-side connecting portion 401 are formed by conductive pins 462. ing. In this case, the pin 462 is disposed in the insertion port 2a of the multilayer substrate 2B by inserting the pin 462 so as to penetrate through the insertion holes 2e formed in the upper and lower laminated substrates 2b and 2d of the insertion port 2a. Can do.

FIG. 11 is a perspective view showing a connection state of a multilayer board and a flat cable to which the multilayer board connector according to the fourth embodiment of the invention is applied, and FIG. 12 is a multilayer board according to the fourth embodiment of the invention. It is a figure which shows the connection state of the multilayer board | substrate with which the connector for connectors was applied, and the flat cable, (a) is a top view of a multilayer board | substrate and a flat cable, (b) is a front view of a multilayer board | substrate and a flat cable, c) is a bottom view of the multilayer substrate and the flat cable, and (d) is a side view of the multilayer substrate and the flat cable.
As shown in this figure, the connector for a multilayer board according to the fourth embodiment of the present invention is different from the above-described embodiment in that it is provided in a plurality of intermediate layers of the multilayer board 2. For example, the example shown in the figure is a multi-layer substrate 2C having a five-layer structure, and an insertion port 2a is provided in the second layer and the fourth layer of the same plate thickness surface, and a substrate side connection portion is configured in each insertion port 2a. ing. In this way, the flat cable 3 can be connected to each of the plurality of intermediate layers of the multilayer substrate 2C.

13 is a perspective view showing a connection state of a multilayer board to which a multilayer board connector according to a fifth embodiment of the present invention is applied and a flat cable, and FIG. 14 is a multilayer board according to the fifth embodiment of the present invention. It is a figure which shows the connection state of the multilayer board | substrate with which the connector for connectors was applied, and the flat cable, (a) is a top view of a multilayer board | substrate and a flat cable, (b) is a front view of a multilayer board | substrate and a flat cable, c) is a bottom view of the multilayer substrate and the flat cable, and (d) is a side view of the multilayer substrate and the flat cable.
As shown in this figure, the multilayer board connector according to the fifth embodiment of the present invention is provided in a plurality of intermediate layers of the multilayer board 2D as in the fourth embodiment, but the flat cable 3 is arranged in different directions. Is different from the fourth embodiment in that it is connected to the multilayer substrate 2D. For example, the example shown in the figure is a multi-layer substrate 2D having a five-layer structure, and an insertion port 2a is provided in the second and fourth layers of adjacent plate thickness surfaces, and a substrate side connection portion is configured in each insertion port 2a. doing. In this way, the flat cable 3 can be connected to the plurality of intermediate layers of the multilayer substrate 2C from different directions.

  Note that the multilayer board connector of the fifth embodiment has a retaining structure for retaining the two flat cables 3 connected to the multilayer board 2 with a single pin 2f. This retaining structure includes an insertion hole 2g formed in the multilayer substrate 2 so that the flat cable 3 (cable side connection portion 101) inserted from different directions penetrates in the vertical direction at a position where it overlaps in plan view; The flat cable 3 (cable side connecting portion 101) side includes an engagement hole (not shown) formed so as to communicate with the insertion hole 2g in the inserted state, and the pin 2f is inserted into the insertion hole 2g in the cable inserted state. By inserting the pin 2f, the pin 2f is engaged with the engagement holes of the two flat cables 3 to prevent the two flat cables 3 from being pulled out.

  The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the above-described embodiments, and various modifications may be made within the scope of the gist of the present invention described in the claims. It can be changed.

  DESCRIPTION OF SYMBOLS 1 ... Board | substrate side connection part 2, 2B, 2C, 2D ... Multilayer board, 2a ... Insertion opening, 2b ... 1st laminated board, 2c ... 2nd laminated board, 2d ... 3rd laminated board, 2e ... Insertion hole, 2f ... Pin, 2g ... Insertion hole, 3 ... Flat cable, 3a ... Base film, 3b ... Conductor pattern, 3c ... Cover film, 51 ... Conductor pattern, 52 ... Insulating space, 61 ... Columnar terminal, 62 ... Gap, 63 ... Small diameter part 71 ... Insertion guide 72 ... Gap 73 ... Insertion guide part 74 ... Stopper part 101 ... Cable side connection part 151 ... First flat plate terminal 152 ... Insulating space 153 ... Tail part 154 ... Columnar terminal insertion portion, 155 ... elastic contact portion, 155a ... base portion, 155b ... arm portion, 155c ... contact portion, 161 ... second flat plate terminal, 162 ... insulating space, 163 ... tail portion, 164 ... columnar terminal insertion portion, 165 ... 165a ... base part, 165b ... arm part, 165c ... contact part, 166 ... non-elastic contact part, 166a ... contact part, 166b ... tip corner, 171 ... support plate, 171a ... tip corner, 201 ... substrate Side connection part 301 ... Cable side connection part 401 ... Board side connection part 461 ... Columnar terminal, 462 ... Pin, 801 ... Board side connection part, 851 ... Leaf spring terminal, 901 ... Cable side connection part

Claims (7)

A board-side connecting portion arranged in an insertion port formed on the plate thickness surface of the multilayer board;
A multilayer board connector comprising: a cable side connection portion provided at a distal end portion of a flat cable and electrically connected to the board side connection portion at an intermediate layer of the multilayer board by insertion into the insertion port. ,
One of the board side connection part or the cable side connection part comprises a columnar terminal, the other comprises a flat terminal,
The columnar terminal is formed to project from the intermediate layer of the multilayer board or the tip of the flat cable in the thickness direction of the multilayer board or the flat cable,
The flat terminal includes an elastic contact portion that elastically contacts a side surface portion of the columnar terminal from a width direction of the insertion port in accordance with insertion of the cable side connection portion into the insertion port. Multi-layer board connector.   The multi-layer board connector according to claim 1, wherein the flat-plate terminal and the columnar terminal have a plurality of contact portions, and reaction forces of the flat-plate terminals generated at the plurality of contact portions cancel each other. .   The reaction force of the flat terminal that contacts the columnar terminal from one side is offset by the reaction force of the flat terminal that contacts the same columnar terminal from the other side. The connector for multilayer boards as described in 2.   The reaction force of the flat terminal that contacts the columnar terminal from one side is offset by the reaction force of the flat terminal that contacts the other columnar terminal from the other side. The connector for multilayer boards as described in any one of 3.   The said columnar terminal is provided with the small diameter part which prescribes | regulates the contact position of the said flat terminal, The connector for multilayer substrates as described in any one of Claims 1-4 characterized by the above-mentioned.   The multilayer substrate connector according to claim 1, wherein the columnar terminal is a protrusion formed by using an etching method.   The board-side connecting portion includes the columnar terminal and an insertion guide formed by using an etching method, and guides insertion of the cable-side connecting portion into the insertion port by the insertion guide. The connector for multilayer boards as described in any one of -6.

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